FR3013646A1 - SYSTEM FOR MOUNTING A HEADREST ON A SEAT BACK OF A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a system for mounting a headrest on a motor vehicle seatback, said system comprising: a rod (2) for associating said headrest with said backrest, said rod comprising at least one notch ( 3) slide lock; a device (4) for receiving said rod comprising: a sleeve (5) for receiving said sliding rod; a slide (6) movably mounted in radial translation on said sleeve; a notch member (7) mounted on said drawer, said member comprising a notch edge (8) for insertion into said notch for locking said sliding rod; an elastic return means (9) actuating said slide in translation so as to cause said edge to be inserted into said notch when they are facing each other, said piece being rotatably mounted on said drawer, so that said edge can remain inserted in said notch when said rod is angularly spaced about its axis of symmetry (15) relative to its nominal angular position.

Description

The invention relates to a system for mounting a headrest on a motor vehicle seat back, a device for receiving such a system, a seat comprising such a device and a headrest comprising such a device.

It is known to provide a system for mounting a headrest on a motor vehicle seatback, said system comprising: a stem for associating said headrest with said backrest, said rod comprising at least one locking catch; slidably, - a device for receiving said rod, said device comprising: - a sleeve for receiving said sliding rod, - a slide mounted movably in radial translation on said sleeve, - a notch member mounted on said slide, said piece comprising a notching edge for inserting into said notch to lock said rod in sliding, - an elastic return means actuating said slide in translation so as to cause insertion of said edge in said notch when they are screwed-to -screw.

In the event of a violent impact of the passenger's head against the headrest, the rod may be rotated with respect to the notch edge, the notch edge may then be pulled out of the notch, which may lead to unblocking of said rod and a risk of sagging or ejection of the headrest in the vehicle, such a situation may be detrimental to the safety of the passenger.

Such a situation of rotation of the rod occurs in particular in the case of a connection of the headrest on the back made by two parallel rods, said rods being connected in the upper part by a cross member.

In the event of an impact of the head of a passenger on a lateral part of the headrest, a "crank effect" can be observed, leading to a rotation of the toothed rod, with the consequence that it can be unlocked. of the sliding rod. The invention aims to overcome this disadvantage.

For this purpose, and according to a first aspect, the invention proposes a system for mounting a headrest on a motor vehicle seatback, said system comprising: a stem for associating said headrest with said backrest; said rod comprising at least one sliding locking notch, - a device for receiving said rod, said device comprising: - a sleeve for receiving said sliding rod, - a slide mounted mobile in radial translation on said sleeve, - a a detent piece mounted on said drawer, said part comprising a notching edge intended to be inserted into said notch for locking said sliding rod; an elastic return means actuating said slide in translation so as to cause said edge to be inserted in said notch when they are facing each other, said part being rotatably mounted on said drawer, so that said edge can remain inserted in said notch when said rod undergoes angular deviation about its axis of symmetry with respect to its nominal angular position.

In this description, the positioning terms in space (top, bottom, top, side, ...) are taken in reference to the device disposed in the vehicle, the seat being in use condition. The axis of symmetry of the rod is defined as that of a cylinder in which said rod is inscribed.

In the case of a curved rod, it is positioned at the notch realizing the locking of the rod to define a localized axis of symmetry evolving as one moves along the rod.

The term "radial" is taken with reference to the axis of symmetry of the rod. A "radial section" is therefore a section made along a plane perpendicular to the axis of symmetry.

With the proposed arrangement, the edge remains inserted into the notch when the rod is angularly spaced about its axis of symmetry with respect to its nominal angular position. This prevents unintentional release of the sliding rod, with the resulting damaging consequences in terms of safety. According to other aspects, the invention proposes a device for receiving such a system, a seat comprising such a device and a headrest comprising such a device.

Other features and advantages of the invention will appear in the description which follows, made with reference to the appended figures, in which: FIG. 1 is an exploded schematic perspective view of a system according to one embodiment, FIG. FIG. 3 is a diagrammatic view in radial section of the system of FIG. 1, a rod in position angular offset from the nominal position being inserted into the receiving device.

With reference to the figures, there is described a mounting system of a headrest, not shown, on a seat back, not shown, of a motor vehicle, said system comprising: - a rod 2 - in particular in the form of a metal tube - associating said headrest with said backrest, said rod comprising at least one sliding locking notch 3, a device 4 for receiving said rod, said device comprising: a sleeve for receiving said sliding rod; a spool 6 movably mounted in radial translation on said sleeve, - a notch member 7 mounted on said spool, said part comprising a notch edge 8 for inserting into said notch for locking said rod in sliding, - a means of resilient return 9 actuating said slide in translation so as to cause said edge to be inserted into said notch when they are facing each other, said part being rotatably mounted on said slide, of said edge can remain inserted into said notch when said rod is angularly spaced about its axis of symmetry relative to its nominal angular position. According to the embodiment shown, the notch 3 has a substantially rectilinear bottom 10 in radial section, the edge 8 in radial section being substantially rectilinear, so as to be able to press against said bottom of the screen when it is inserted therein. According to the embodiment shown, the notch piece 7 has a general shape of washer intended to receive the rod 2, said washer having an inner periphery portion forming a notch edge 8, said part being engaged in the drawer 6 so as to be able to to be mobile in rotation. The part 7 is in particular held relative to an axial displacement by abutment upwards and downwards against the internal walls of a cavity 11 for receiving the slide 6.

According to the embodiment shown, the inner periphery portion of the washer 8 forming a notch edge is rectilinear. According to the embodiment shown, the notch member 7 comprises a projection 12 radially outwardly, said projection fitting between two lugs 13 deformable, from the drawer 6, holding in nominal position of said piece. If the rod 2 is urged in rotation, the pin 13 concerned deforms to allow the part 7 to perform a rotation corresponding to that of said rod.

According to the embodiment shown, the slide 6 has two stops 14 for limiting the angular travel of the part 7, said stops being arranged so as to cooperate with the projection 12.

In the absence of such stops 14, the part 7 is capable of rotating a complete revolution. We now describe a device 4 for receiving a system 1, said device comprising: - a sleeve 5 for receiving a rod 2 in sliding, - a slide 6 mounted to move radially on said sleeve, - a part 7 notch member mounted on said drawer, said part comprising a notch edge 8 intended to fit into a notch 3 of said rod to block it in sliding, - an elastic return means 9 actuating said slide in translation so as to cause a insertion of said edge into said notch when they are in facing relation, said piece is rotatably mounted on said drawer, so that said edge can remain inserted into said notch when said rod is angularly spaced about its axis of symmetry with respect to its nominal angular position.

It will now be described, in a manner not represented, a motor vehicle seat comprising such a device 4, said device being mounted at the top of the back of said seat so as to receive a rod 2 issuing from a headrest. Finally, not shown, a headrest of a motor vehicle comprising such a device 4, said device being integrally mounted to a cushion of said headrest so as to receive a rod 2 from a seat back.

Claims (8)

REVENDICATIONS1. System for mounting a headrest on a motor vehicle seatback, said system comprising: a rod (2) for associating said headrest with said backrest, said rod comprising at least one notch (3) for locking slidably, - a device (4) for receiving said rod, said device comprising: - a sleeve (5) for receiving said sliding rod, - a slide (6) mounted to move radially on said sleeve, - a notch member (7) mounted on said drawer, said part comprising a notch edge (8) intended to be inserted into said notch to block said rod in sliding, - an elastic return means (9) actuating said drawer in translation so as to cause an insertion of said edge into said notch when they are opposite, said system being characterized in that said piece is rotatably mounted on said drawer, so that said edge can remain inserted in said notch; when said rod is angularly spaced about its axis of symmetry (15) relative to its nominal angular position. 2. System according to claim 1, characterized in that the notch (3) has in radial section a bottom (10) substantially rectilinear, the edge (8) in radial section being substantially rectilinear, so as to be pressed against said bottom notch when inserted into it. 3. System according to one of claims 1 or 2, characterized in that the piece (7) of notching has a general form of washer for receiving the rod (2), said washer having an edge periphery portion inner edge ( 8), said piece being engaged in the slide (6) so as to be rotatable. 4. System according to claim 3, characterized in that the part (7) of detent comprises a projection (12) radially outwardly, said projection fitting between two lugs (13) deformable holding in nominal position of said piece, said lugs being from the drawer (6). 5. System according to claim 4, characterized in that the slide (6) has two stops (14) for limiting the angular travel of the part (7), said stops being arranged so as to cooperate with the projection (12). ). 6. Device for receiving a system according to any one of claims 1 to 5, said device comprising: - a sleeve (5) for receiving a rod (2) in sliding - a drawer (6) mounted movably in radial translation on said sleeve, - a notch piece (7) mounted on said drawer, said piece comprising a notch edge (8) intended to fit into a notch (3) of said rod to block it slidably, an elastic return means (9) actuating said slide in translation so as to cause said edge to be inserted into said notch when they are opposite each other, said device being characterized in that said piece is mounted to be rotatable on said drawer, so that said edge can remain inserted into said notch when said rod is angularly spaced about its axis of symmetry (15) relative to its nominal angular position. 7. Motor vehicle seat comprising a device according to claim 6, said device being mounted at the top of said seat back to receive a rod (2) from a headrest. 8. Headrest of a motor vehicle comprising a device according to claim 6, said device being integrally mounted to a cushion of said headrest so as to receive a rod (2) from a seat back.